On 6 July 1963, following the death of her father in law her husband became the new head of the House of Mecklenburg-Strelitz. Ilona and Georg Alexander had three daughters and a son before divorcing on 12 December 1974.[citation needed]
Married Alhard, Baron von dem Bussche-Ippenburg (born 30 June 1947) civilly on 15 November 1974 in Lüdenscheid and religiously on 3 May 1975 at Hohenzollern Castle. Had two daughters and one son, Ricarda, Josina and Gabriel before divorcing on 15 December 1997.
Duchess Marie Catherine
14 November 1949
Married Wolfgang von Wasielewski (born 15 December 1951) civilly on 17 March 1978 at Bonn and religiously on 15 July at Biengen. Has two children, Natalia and Alexander.
Duchess Irene
18 April 1952
Married Constantin Harmsen (born 28 April 1954) civilly on 22 September 1979 at Mexico City and religiously at Biengen on 26 July 1980. Has two sons, Maximilian and Moritz.
Married Alice Wagner (born 2 August 1959) in Hinterzarten civilly on 24 December 1985 and religiously on 19 July 1986. Has three children, Olga, Alexander and Michael, and is the current head of the House of Mecklenburg-Strelitz.
Generations are numbered by male-line descent from Frederick III, Holy Roman Emperor. Later generations are included although Austrian titles of nobility were abolished and outlawed in 1919.